Ultrasonic scanning head and method

Details Ultrasonic scanning head and method Ultrasonic scanning head and method

1995-04-25

1997-04-29

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73635, G01N 2904

Patent

active

056251483

ABSTRACT:
A acoustical imaging scanning head includes a roller driven optical encoder. The encoder and its shaft are isolated in a non-magnetic housing. The encoder shaft and a roller driven drive shaft are provided with permanent magnets on facing steel discs on opposite sides of a relatively thin wall of a non-magnetic housing. The encoder is sealed in a chamber in such housing and is totally isolated from the surrounding environment, including the drive shaft. The position and arrangement of the magnets maintains the ability to rotate the encoder shaft to produce electrical pulses proportional to the encoder shaft rotation.

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